1 | /* |
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2 | * RTEMS monitor server (handles requests for info from RTEMS monitors |
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3 | * running on other nodes) |
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4 | */ |
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5 | |
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6 | #ifdef HAVE_CONFIG_H |
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7 | #include "config.h" |
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8 | #endif |
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9 | |
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10 | #include <rtems.h> |
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11 | |
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12 | #include <stdio.h> |
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13 | #include <string.h> |
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14 | #include <stdlib.h> |
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15 | #include <unistd.h> |
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16 | |
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17 | #include <rtems/monitor.h> |
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18 | #include <rtems/score/sysstate.h> |
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19 | |
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20 | /* |
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21 | * Various id's for the server |
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22 | */ |
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23 | |
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24 | rtems_id rtems_monitor_server_task_id; |
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25 | rtems_id rtems_monitor_server_request_queue_id; /* our server */ |
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26 | rtems_id *rtems_monitor_server_request_queue_ids; /* all servers */ |
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27 | rtems_id rtems_monitor_server_response_queue_id; /* our server */ |
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28 | |
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29 | |
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30 | /* |
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31 | * Send a request to a server task |
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32 | */ |
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33 | |
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34 | rtems_status_code |
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35 | rtems_monitor_server_request( |
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36 | uint32_t server_node, |
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37 | rtems_monitor_server_request_t *request, |
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38 | rtems_monitor_server_response_t *response |
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39 | ) |
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40 | { |
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41 | rtems_id server_id; |
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42 | rtems_status_code status; |
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43 | size_t size; |
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44 | |
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45 | /* |
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46 | * What is id of monitor on target node? |
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47 | * Look it up if we don't know it yet. |
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48 | */ |
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49 | |
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50 | server_id = rtems_monitor_server_request_queue_ids[server_node]; |
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51 | if (server_id == 0) |
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52 | { |
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53 | status = rtems_message_queue_ident(RTEMS_MONITOR_QUEUE_NAME, |
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54 | server_node, |
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55 | &server_id); |
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56 | if (status != RTEMS_SUCCESSFUL) |
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57 | { |
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58 | rtems_error(status, "ident of remote server failed"); |
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59 | goto done; |
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60 | } |
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61 | |
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62 | rtems_monitor_server_request_queue_ids[server_node] = server_id; |
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63 | } |
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64 | |
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65 | request->return_id = rtems_monitor_server_response_queue_id; |
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66 | |
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67 | status = rtems_message_queue_send(server_id, request, sizeof(*request)); |
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68 | if (status != RTEMS_SUCCESSFUL) |
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69 | { |
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70 | rtems_error(status, "monitor server request send failed"); |
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71 | goto done; |
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72 | } |
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73 | |
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74 | /* |
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75 | * Await response, if requested |
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76 | */ |
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77 | |
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78 | if (response) |
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79 | { |
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80 | status = rtems_message_queue_receive(rtems_monitor_server_response_queue_id, |
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81 | response, |
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82 | &size, |
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83 | RTEMS_WAIT, |
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84 | 100); |
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85 | if (status != RTEMS_SUCCESSFUL) |
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86 | { |
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87 | rtems_error(status, "server did not respond"); |
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88 | |
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89 | /* maybe server task was restarted; look it up again next time */ |
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90 | rtems_monitor_server_request_queue_ids[server_node] = 0; |
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91 | |
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92 | goto done; |
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93 | } |
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94 | |
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95 | if (response->command != RTEMS_MONITOR_SERVER_RESPONSE) |
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96 | { |
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97 | status = RTEMS_INCORRECT_STATE; |
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98 | goto done; |
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99 | } |
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100 | } |
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101 | |
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102 | done: |
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103 | return status; |
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104 | } |
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105 | |
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106 | |
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107 | |
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108 | /* |
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109 | * monitor server task |
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110 | */ |
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111 | |
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112 | void |
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113 | rtems_monitor_server_task( |
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114 | rtems_task_argument monitor_flags RTEMS_UNUSED |
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115 | ) |
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116 | { |
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117 | rtems_monitor_server_request_t request; |
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118 | rtems_monitor_server_response_t response; |
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119 | rtems_status_code status; |
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120 | size_t size; |
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121 | |
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122 | for (;;) |
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123 | { |
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124 | status = rtems_message_queue_receive( |
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125 | rtems_monitor_server_request_queue_id, |
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126 | &request, |
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127 | &size, |
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128 | RTEMS_WAIT, |
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129 | (rtems_interval) 0); |
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130 | |
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131 | if (status != RTEMS_SUCCESSFUL) |
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132 | { |
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133 | rtems_error(status, "monitor server msg queue receive error"); |
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134 | goto failed; |
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135 | } |
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136 | |
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137 | if (size != sizeof(request)) |
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138 | { |
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139 | rtems_error(0, "monitor server bad size on receive"); |
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140 | goto failed; |
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141 | } |
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142 | |
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143 | switch (request.command) |
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144 | { |
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145 | case RTEMS_MONITOR_SERVER_CANONICAL: |
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146 | { |
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147 | rtems_monitor_object_type_t object_type; |
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148 | rtems_id id; |
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149 | rtems_id next_id; |
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150 | |
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151 | object_type = (rtems_monitor_object_type_t) request.argument0; |
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152 | id = (rtems_id) request.argument1; |
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153 | next_id = rtems_monitor_object_canonical_get(object_type, |
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154 | id, |
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155 | &response.payload, |
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156 | &size); |
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157 | |
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158 | response.command = RTEMS_MONITOR_SERVER_RESPONSE; |
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159 | response.result0 = next_id; |
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160 | response.result1 = size; |
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161 | |
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162 | #define SERVER_OVERHEAD (offsetof(rtems_monitor_server_response_t, \ |
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163 | payload)) |
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164 | |
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165 | status = rtems_message_queue_send(request.return_id, |
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166 | &response, |
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167 | size + SERVER_OVERHEAD); |
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168 | if (status != RTEMS_SUCCESSFUL) |
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169 | { |
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170 | rtems_error(status, "response send failed"); |
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171 | goto failed; |
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172 | } |
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173 | break; |
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174 | } |
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175 | |
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176 | default: |
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177 | { |
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178 | rtems_error(0, "invalid command to monitor server: %d", request.command); |
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179 | goto failed; |
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180 | } |
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181 | } |
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182 | } |
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183 | |
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184 | failed: |
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185 | rtems_task_delete(RTEMS_SELF); |
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186 | } |
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187 | |
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188 | |
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189 | /* |
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190 | * Kill off any old server |
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191 | * Not sure if this is useful, but it doesn't help |
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192 | */ |
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193 | |
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194 | void |
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195 | rtems_monitor_server_kill(void) |
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196 | { |
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197 | if (rtems_monitor_server_task_id) |
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198 | rtems_task_delete(rtems_monitor_server_task_id); |
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199 | rtems_monitor_server_task_id = 0; |
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200 | |
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201 | if (rtems_monitor_server_request_queue_id) |
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202 | rtems_message_queue_delete(rtems_monitor_server_request_queue_id); |
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203 | rtems_monitor_server_request_queue_ids = 0; |
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204 | |
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205 | if (rtems_monitor_server_response_queue_id) |
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206 | rtems_message_queue_delete(rtems_monitor_server_response_queue_id); |
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207 | rtems_monitor_server_response_queue_id = 0; |
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208 | |
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209 | if (rtems_monitor_server_request_queue_ids) |
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210 | free(rtems_monitor_server_request_queue_ids); |
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211 | rtems_monitor_server_request_queue_ids = 0; |
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212 | } |
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213 | |
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214 | |
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215 | void |
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216 | rtems_monitor_server_init( |
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217 | uint32_t monitor_flags RTEMS_UNUSED |
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218 | ) |
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219 | { |
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220 | #if defined(RTEMS_MULTIPROCESSING) |
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221 | rtems_status_code status; |
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222 | |
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223 | if (_System_state_Is_multiprocessing && |
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224 | (_Configuration_MP_table->maximum_nodes > 1)) |
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225 | { |
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226 | uint32_t maximum_nodes = _Configuration_MP_table->maximum_nodes; |
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227 | |
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228 | /* |
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229 | * create the msg que our server will listen |
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230 | * Since we only get msgs from other RTEMS monitors, we just |
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231 | * need reserve space for 1 msg from each node. |
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232 | */ |
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233 | |
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234 | status = rtems_message_queue_create( |
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235 | RTEMS_MONITOR_QUEUE_NAME, |
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236 | maximum_nodes, |
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237 | sizeof(rtems_monitor_server_request_t), |
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238 | RTEMS_GLOBAL, |
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239 | &rtems_monitor_server_request_queue_id); |
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240 | |
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241 | if (status != RTEMS_SUCCESSFUL) |
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242 | { |
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243 | rtems_error(status, "could not create monitor server message queue"); |
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244 | goto done; |
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245 | } |
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246 | |
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247 | /* |
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248 | * create the msg que our responses will come on |
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249 | * Since monitor just does one thing at a time, we only need 1 item |
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250 | * message queue. |
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251 | */ |
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252 | |
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253 | status = rtems_message_queue_create( |
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254 | RTEMS_MONITOR_RESPONSE_QUEUE_NAME, |
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255 | 1, /* depth */ |
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256 | sizeof(rtems_monitor_server_response_t), |
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257 | RTEMS_GLOBAL, |
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258 | &rtems_monitor_server_response_queue_id); |
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259 | |
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260 | if (status != RTEMS_SUCCESSFUL) |
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261 | { |
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262 | rtems_error(status, "could not create monitor response message queue"); |
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263 | goto done; |
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264 | } |
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265 | |
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266 | /* need an id for queue of each other server we might talk to */ |
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267 | /* indexed by node, so add 1 to maximum_nodes */ |
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268 | rtems_monitor_server_request_queue_ids = |
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269 | (rtems_id *) malloc((maximum_nodes + 1) * sizeof(rtems_id)); |
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270 | (void) memset(rtems_monitor_server_request_queue_ids, |
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271 | 0, |
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272 | (maximum_nodes + 1) * sizeof(rtems_id)); |
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273 | |
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274 | rtems_monitor_server_request_queue_ids[rtems_monitor_node] = |
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275 | rtems_monitor_server_request_queue_id; |
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276 | |
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277 | /* |
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278 | * create the server task |
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279 | */ |
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280 | status = rtems_task_create(RTEMS_MONITOR_SERVER_NAME, |
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281 | 1, |
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282 | 0 /* default stack */, |
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283 | RTEMS_INTERRUPT_LEVEL(0), |
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284 | RTEMS_DEFAULT_ATTRIBUTES, |
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285 | &rtems_monitor_server_task_id); |
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286 | if (status != RTEMS_SUCCESSFUL) |
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287 | { |
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288 | rtems_error(status, "could not create monitor server task"); |
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289 | goto done; |
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290 | } |
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291 | |
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292 | /* |
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293 | * Start the server task |
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294 | */ |
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295 | status = rtems_task_start(rtems_monitor_server_task_id, |
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296 | rtems_monitor_server_task, |
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297 | monitor_flags); |
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298 | if (status != RTEMS_SUCCESSFUL) |
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299 | { |
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300 | rtems_error(status, "could not start monitor server"); |
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301 | goto done; |
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302 | } |
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303 | } |
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304 | |
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305 | done: |
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306 | #endif |
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307 | return; |
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308 | } |
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